Portion of a ball joint assembly



FIG. 1 is a perspective view of the design according to the present invention;

FIG. 2 is a perspective view of the design according to the present invention;

FIG. 3 is a perspective view of the design according to the present invention;

FIG. 4 is a top plan view of the design according to the present invention;

FIG. 5 is a front elevation view of the design according to the present invention;

FIG. 6 is a rear elevation view of the design according to the present invention;

FIG. 7 is a left side elevation view of the design according to the present invention;

FIG. 8 is a right side elevation view of the design according to the present invention; and,

FIG. 9 is a bottom plan view of the design according to the present invention.

The broken lines in the drawings are environmental and form no part of the claimed design. 

The ornamental design for a portion of a ball joint assembly, as shown and described. 